Sofa



FIG. 1 is a front perspective view of an embodiment of a sofa according to the invention;

FIG. 2 is a front view of a sofa according to the invention;

FIG. 3 is a back perspective view of the sofa;

FIG. 4 is a right side view of the sofa;

FIG. 5 is a left side view of the sofa;

FIG. 6 is a top view of the sofa; and,

FIG. 7 is a bottom view of the sofa. 

The ornamental design for a sofa, as shown and described. 